/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

https://axmol.dev/

Permission is hereby granted, free of charge, to any person obtaining a copy
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The above copyright notice and this permission notice shall be included in
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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****************************************************************************/

#ifndef __ccRandom_H_
#define __ccRandom_H_

#include <random>
#include <cstdlib>

#include "platform/PlatformConfig.h"

/**
 * @addtogroup base
 * @{
 */
namespace ax
{

#define AX_RAND_MAX 2147483647

/**
 * @class RandomHelper
 * @brief A helper class for creating device dependent random number
 * @remark
 *     Random Generator: std::mt19937 32bit
 */
class AX_DLL RandomHelper
{
public:
    template <typename T>
    static T random_real(T min, T max)
    {
        std::uniform_real_distribution<T> dist(min, max);
        auto& mt = RandomHelper::getEngine();
        return dist(mt);
    }

    template <typename T>
    static T random_int(T min, T max)
    {
        std::uniform_int_distribution<T> dist(min, max);
        auto& mt = RandomHelper::getEngine();
        return dist(mt);
    }

private:
    static std::mt19937& getEngine();
};

/**
 * Returns a random value between `min` and `max`.
 */
template <typename T>
inline T random(T min, T max)
{
    return RandomHelper::random_int<T>(min, max);
}

template <>
inline float random(float min, float max)
{
    return RandomHelper::random_real(min, max);
}

template <>
inline long double random(long double min, long double max)
{
    return RandomHelper::random_real(min, max);
}

template <>
inline double random(double min, double max)
{
    return RandomHelper::random_real(min, max);
}

/**
 * Returns a random int between 0 and AX_RAND_MAX.
 */
inline int random()
{
    return ax::random(0, AX_RAND_MAX);
};

/// Follow random APIs is device independent,  need set seed by std::srand
/// DEPRECATED: use FastRGN.h or c++11 'std::minstd_rand' or 'std::minstd_rand0' instead

/**
 * Returns a random float between -1 and 1.
 * It can be seeded using std::srand(seed);
 */
inline float rand_minus1_1()
{
    return ((std::rand() / (float)RAND_MAX) * 2) - 1;
}

/**
 * Returns a random float between 0 and 1.
 * It can be seeded using std::srand(seed);
 */
inline float rand_0_1()
{
    return std::rand() / (float)RAND_MAX;
}

}
// end group
/// @}
#endif  //__ccRandom_H_
